Supporting Information for. A BODIPY Dye as Reactive Chromophric/Fluorogenic Probe. for Selective and Quick Detection of Vapors of Secondary.
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1 Supporting Information for A DIPY Dye as Reactive Chromophric/Fluorogenic Probe for Selective and Quick Detection of Vapors of Secondary Amines Yanyan Fu, a Qingguo He,* a Defeng Zhu, a Yuerong Wang, a,b Yixun Gao, a,b Huimin Cao a and Jiangong Cheng* a a State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Changning Road 865, Shanghai, , China b Graduate School of the Chinese Academy of Sciences, Yuquan Road 19, eijing , China General:UV-vis absorption and fluorescence analysis were conducted on a Jasco V-670spectrophotometer and a Jasco FP 6500 spectrometer, respectively. The 1 H and 13 C MR spectra were obtained from a rucker DRX500 instrument, and tetramethylsilane (TMS) was used as an internal standard. Mass spectra were recorded on IFLEX III MALDI-TF (rucker Daltonics Inc.) and GCT-MS Micromass UK mass spectrometers. All the films on (10 20 mm) quartz plates were spin-coated at 2500 rpm from their M THF solutions, and placed in vacuum for 1 hour before use. The fluorescence responses of films to various analytes were progressed by inserting the films into sealed vials (3.8 ml) at room temperature containing cotton and analytes, which prevents direct film analyte contact and helps to maintain a constant
2 vapor pressure. The fluorescence time-course responses were recorded immediately after exposing the films to analytes by front-face (30 ) detection. Quantum efficiencies of DIPY 3 and DIPY 4 in the solid state (films) were recorded on FLSP 920 fluorescence spectroscopy with a calibrated integrating sphere system. Materials: All solvents and reagents were obtained from commercial sources and used as received. Scheme S1 C 8 H 17 C 8 H 17 H C 8 H 17 C 8 H 17 H M1 H H M2 M3 H M4 H H H M5 M6 M7 M8 General synthesis of M2, M4, M6, M8 Excess secondary amine (4-20equiv.) was added to a solution of reactant (M1, M3, M5 and M7) in common solvents. The solution was stirred at room temperature for half an hour. Then the solvent was evaporated and the residue was purified by column chromatography on silica gel using CH 2 Cl 2 as eluent to afford corresponding products with high yields (87%, 91%, 63% and 70% for M2, M4, M6, M8, respectively) M2, 1 H-MR(500MHz, CDCl 3, 25 ºC, TMS): δ= (d, 1H, J= 7.25 Hz), (d, 1H, J= 8.05 Hz), (m, 2H), (m,
3 1H),6.81 (d, 1H, J = 2.1Hz), (m,1H), 4.96(s, 1H), (m, 4H), (m, 4H), (m, 16H), (m, 6H), (m, 4H). MS:MALDI-TF M4, 1 H-MR(500MHz, CDCl 3, 25ºC, TMS): δ= (m, 9H), 5.64(s, 1H) MS:EI 220 M6, 1 H-MR(500MHz,CDCl 3,25 ºC,TMS):δ=8.36(s, 1H),7.94(s 2H), (m, 2H), (m, 1H), (m, 1H), 6.12(s, 1H) MS:EI 144 M8, 1 H-MR(500MHz,CDCl 3,25 ºC,TMS):δ=8.31(s, 1H),8.10(d, 1H, J= 4.35Hz), (m, 2H), (m, 1H) MS:EI 95 Synthesis and Characterization r F S CH (1) (2) (3) r S F (4) S C 8 H 17 C 8 H F F Synthesis of 8-(5-bromo-2-thienyl)-4, 4-difluoro-4-bora-3a, 4a-diaza -s-indacene 2: 5-romo-2-thiophene carboxaldehyde (1.9 g, 10 mmol) and pyrrole(2.68 g, 40 mmol) were dissolved in anhydrous methylene dichloride (30 ml) under argon atmosphere. ne drop of trifluoroacetic acid was added, and the solution was stirred at room temperature
4 overnight. A solution of 2, 3-dichloro-5, 6-dicyano-1, 4-benzoquinone (4.54 g, 1mmol) in anhydrous methylene dichloride was added by a syringe, and the stirring was continued for another 4 hours. After the addition of triethylamine (15mL), F 3 Et 2 (15mL) was gradually added during 30 min in ace-water bath followed by continuous stirring at room temperature overnight. The reaction solution was shaken with 5% aqueous sodium bicarbonate (100ml), and the mixture was passed through a celite pad and washed with MC (30ml) to remove the black solid. The organic layer was washed with water and dried over anhydrous sodium sulfate. After concentration in vacuum, the residue was purified by flash chromatograophy twice, to afford a purple solid, Yield 28%. 1 H-MR(500MHz, CDCl 3, 25 ºC, TMS): δ=7.926 (s, 2H),7.31 (d, 1H,, J =2.15Hz), (m, 3H), 6.57 (d, 2H, J =3.6Hz). 13 C MR (CDCl 3 ) δ137.92, , , , , , , HRMS: calcd M + for C 13 H 8 2 F 2 Sr ; found Synthesis of 7-(8-(4,4-difluoro-4-bora-3a,4a-diaza-s-indacene))- 2- (4, 4, 5, 5-tetramethyl-1, 3,2-dioxaborolan-2-yl) -9, 9 dioctylfluorene 3: To a 1:1 mixture of 9, 9-dioctylfluorene-2, 7-bis (4, 4, 5, 5-tetramethyl-1, 3, 2-dioxaborolane) and 8-(5-bromo-2-thienyl)-4, 4-difluoro-4-bora-3a, 4a-diaza-s-indacene, and tetra (triphenylphosphine)-palladium [Pd(PPh 3 ) 4 ](1.0 Mol %) in THF solution was added a degassed mixture of a drop of phase Aliquat 336 and 2 M
5 potassium carbonate aqueous solution. The mixture was stirred at 80 for 24 hours under the protection of argon. Then the solvent was evaporated and the residue was purified by column chromatography on silica gel using CH 2 Cl 2 as eluent to afford burgundy solid (yield 33%). 1 H-MR(500MHz, CDCl 3, 25ºC, TMS): δ=7.93(s, 2H), 7.84(d, 1H, J = 7.55 Hz), 7.77 (d, 2H, J = 7.9 Hz), 7.72(d, 1H, J =7.5 Hz), 7.68(d, 1H, J = 7.75 Hz), 7.61(d, 2H, J = 4.25 Hz), 7.54(d, 1H, J=3.65 Hz), 7.40(d, 2H, J = 3.7 Hz), 6.6 (d, 2H, J = 2.55 Hz), 2.0(m, 4H), 1.39(s, 12H), 1.20(m, 4H), (m, 16H), 0.79(m, 6H), 0.62(m, 4H), 13 C MR (CDCl 3 ) δ152.55, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , HRMS: calcd M + for C 48 H F 2 S ; found C 8 H 17 C 8 H 17 F S F Secongdary amine H C 8 H 17 C 8 H S F F Synthesis of 7-(8-(4, 4-difluoro-4-bora-3a, 4a-diaza-s-indacene))-2- hydroxyl -9, 9 -dioctylfluorene 4: To a solution of 3 in CH 2 Cl 2, excess secondary amine (4eq-20eq) was added, and then the solution was stirred at room temperature for half an
6 hour. After that, the solvent was evaporated and the residue was purified by column chromatography on silica gel using CH 2 Cl 2 as eluent to afford purple solid with the yield of nearly 100%. 1 H-MR(500MHz, CDCl 3, 25 ºC, TMS): δ=7.93 (s, 2H), (m, 3H), (m, 2H), 7.52 (d, 1H, J = 3.9 Hz), 7.42(d, 2H, J = 4.05 Hz), 6.84(d, 1H, J = 2.05 Hz), 6.79(m, 1H), 6.6(m, 2H), 2.02(m, 4H), 1.20(m, 4H), (m,16H),0.80 (m, 6H), 0.64(m, 4H), C 13 MR (CDCl 3 ) δ156.06, , , , , , , , , , , , , , , , , , , , , 55.24, 40.47, 31.75, 29.96, 29.68, 29.19, 24.89, 23.70, 22.56, 14.03, HRMS: calcd M + for C 42 H 49 2 F 2 S ; found Supporting results and discussion: 1 The reaction mechanism of secondary amine accelerating the oxidation of arylboronate(or aryl boronic acids) and the reason for why only the secondary amine can promote this reaction. Scheme S2. Proposed reaction mechanism. (1) Controlled experiments validate that the probe 3 cannot react with
7 secondary amine under the conditions without 2 which indicate that 2 acts as the oxidant during the reaction process. (2) Many factors can affect the alkalinity of the organic amine. Among them, the inductive effect and the steric interaction play the key role to identify the alkalinity of organic amines. Customarily, the alkalinity of organic amine is secondary amine>primary amine> tertiary amine. For example, the pk b s of methyl amine, dimethylamine, and trimethyl amine are 3.34, 3.27 and 4.19 respectively. ote that, in terms of pk b, the strongest bases have the least positive values of pk b. This also explains why the secondary amines can accelerate the oxidation of arylboronate(or aryl boronic acids) but primary and tertiary amines cannot. (3) When the organic base is replaced by tetrabutyl ammonium hydroxide, a kind of organic strong base, this reaction occurs immediately. The color of the solution was observed to turn to violent first and then turn to yellow rapidly. This is because the new generated phenol is unstable in strong alkaline environment, and rapidly decomposes into sub-products. Finally, the TLC monitoring indicates the leftover in the solution is complex mixture. This explains that the final product phenol is obtained only when the organic amine with moderate strength like the secondary amine act as a catalyst. Scheme S3. The yields of different reactions when DIPY 3(10 mm/l)
8 reacted with diversiform amines (40 equiv.) in THF solution for 10mins. Entry Yield Trace Trace 97% 100% Trace Trace o 1 propylamine 2 hexylamine 3 diethylamine 4 diisopropylamine 5 triethylamine 6 benzylamine 7 aniline Fig. S1 Absorbance spectra (a) and Fluorescence spectra (b) of DIPY 3 (20 µm) in the presence of increasing diethylamine concentrations (0, 8, 16, 24, 32, 40µM) in THF solution. Fig S2 Absorption spectra of DPY 3 and DPY 4 (10µM) in THF solution.
9 2 The fluorescence quenching mechanism upon formation of phenol. (a) LUM (b) PET LUM fluorescence fluorescence quench HM HM excited fluorophore (electron donor) electron acceptor excited fluorophore (electron donor) electron acceptor Fig S3. Schematic representation of PET strategy to control fluorescence. (a)the boronate ester acts as the electron acceptor; (b) the phenol acts as the electron acceptor. The fluorescence quenching mechanism is a typical photo induced electron transfer (PET) mechanism [1]. In the DIPY 3, the boronate ester acts as the electron acceptor and the DIPY group acts as the fluorophore. The PET does not occur because the boronate ester has a higher LUM energy level than the excited fluorophere. When the boronate ester is replaced by phenol, the new formed electron acceptor has a lower LUM energy level than the excited fluorophere. Thus, the PET occurs and the fluorescence is quenched.
10 ormalized PL Intensity Day Fig S4 The fluorescence stability of the films made from DIPY 3 after exposure in air. Fig S5 Fluorescence quenching efficiency (1-I/I 0 ) as a function of the vapor pressure of DIPA and DEA fitted with Langmuir equation.
11 Fig S6 Color (a) and fluorescence (b) images of the test papers made from DIPY 3 before and after exposure to saturated diisopropylamine vapor for 300s. References [1] M. Takuya, U. Yasuteru, T. Yoshinori, M. Yusuke, T. Takuya and. Tetsuo, J. rg. Chem. 2011, 76,
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